You can make a 17 foot kayak with 1.5 gallons of epoxy, but you are right, having some extra is not a mistake.

: The 1.5 gallons is for the total resin and hardner. They usually call this a
: 1.5 gallon kit. I think that 1.5 gallons is on the minimum side for a
: strip boat. I might order more just to have to avoid ordering again when
: you don't have the economics of scale working with you.